a severe storm的用法和样例：
- The sailor prophesied a severe storm.
- These clouds are ominous. They portend a severe storm.
- A severe storm turned the small village down to ground.
- A severe storm ripped through the Midwest in United States on Sunday, killing 22 people and injuring hundreds more.
- The radio had mentioned a severe storm advisory but the sky was clear and it was rather calm.